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We present a new energy transport code that models the time dependent andnon-linear evolution of spectra of cosmic-ray nuclei, their secondaries, andphoton target fields. The software can inject an arbitrary chemical compositionincluding heavy elements up to iron nuclei. Energy losses and secondaryproduction due to interactions of cosmic ray nuclei, secondary mesons, leptons,or gamma-rays with a target photon field are available for all relevantprocesses, e.g., photo-meson production, photo disintegration, synchrotronradiation, Inverse Compton scattering, and more. The resulting x-ray fluxes canbe fed back into the simulation chain to correct the initial photon targets,resulting in a non-linear treatment of the energy transport. The modularstructure of the code facilitates simple extension of interaction or targetfield models. We will show how the software can be used to improve predictionsof observables in various astrophysical sources such as jetted active galacticnuclei (AGN). Since the software can model the propagation of heavyultrahigh-energy cosmic rays inside the source it can precisely predict thechemical composition at the source. This will also refine predictions ofneutrino emissions - they strongly depend on the chemical composition. Thishelps in the future to optimize the selection and analyses of data from theIceCube neutrino observatory with the aim to enhance the sensitivity of IceCubeand reduce the number of trial factors.

Efficient Modeling of Heavy Cosmic Rays Propagation in Evolving Astrophysical Environments